/*
 * The MIT License
 *
 * Copyright (c) 2011 Takahiro Hashimoto
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package jp.a840.websocket;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.SortedMap;
import java.util.TreeMap;

/**
 * The Class HttpHeader.
 *
 * @author Takahiro Hashimoto
 */
public class HttpHeader {

    /**
     * The header map.
     */
    private SortedMap<String, List<String>> headerMap = new TreeMap<String, List<String>>();

    /**
     * Instantiates a new http response headers.
     */
    public HttpHeader() {
    }

    /**
     * Gets the header value.
     *
     * @param name the name
     * @return the header value
     */
    public String getHeaderValue(String name) {
        name = name.toLowerCase();
        List<String> list = headerMap.get(name);
        if (list == null) {
            return null;
        }
        return list.get(0);
    }

    /**
     * Gets the header values.
     *
     * @param name the name
     * @return the header values
     */
    public List<String> getHeaderValues(String name) {
        name = name.toLowerCase();
        List<String> list = headerMap.get(name);
        if (list == null) {
            return null;
        }
        return Collections.unmodifiableList(list);
    }

    /**
     * Contains header.
     *
     * @param name the header name
     * @return true, if successful
     */
    public boolean containsHeader(String name) {
        name = name.toLowerCase();
        return headerMap.containsKey(name);
    }

    /**
     * Adds the header.
     *
     * @param name  the name
     * @param value the value
     */
    public void addHeader(String name, String value) {
        name = name.toLowerCase();
        List<String> list = headerMap.get(name);
        if (list == null) {
            list = new ArrayList<String>();
            headerMap.put(name, list);
        }
        list.add(value);
    }

    /**
     * Removes the header.
     *
     * @param name the name
     */
    public void removeHeader(String name) {
        name = name.toLowerCase();
        headerMap.remove(name);
    }

    /**
     * Gets the header names.
     *
     * @return the header names
     */
    public List<String> getHeaderNames() {
        return new ArrayList<String>(headerMap.keySet());
    }
}
